Catch two transits of Io, spot sparkling star clusters, and view Mars at aphelion while the April Full Moon lights the sky this week.

There is no other moon quite like our own in the entire solar system. The Moon is unique in a lot of ways, some of which are ...

Ganymede’s transit begins around 9:30 P.M ... lies just to the upper left of the Moon. Even with our satellite’s bright light nearby, you’ll likely still be able to tell that this star ...

In the great tug-of-war between the Sun and its planets, Jupiter, Saturn, and Uranus are much more susceptible to solar ...

Ganymede, Jupiter's largest moon and the solar system's largest ... The Moon is Earth's only natural satellite, orbiting at an average distance of about 238,855 miles (3,84,000 km), and it's tidally ...

As the night sky unfolds, a subtle yet captivating smudge of stars emerges high above at sunset. Known as the Beehive Cluster ...

BOULDER, Colo. — Satellite operators need better space weather models to maximize the life of their satellites and to avoid collisions in low Earth orbit. The growth in the population of ...

Texting via satellite comes to customers with recent Pixel and Galaxy phones starting today. Texting via satellite comes to customers with recent Pixel and Galaxy phones starting today.

Satellite imagery from Planet Labs PBC analyzed by ABC News shows at least six B-2 bombers on April 1 on the runway of Naval Support Facility Diego Garcia, a British naval base leased to the U.S ...